Remove hbtl attribute of non-scsi devices

hbtl addressing has no meaning when it comes to cciss
(and also non-scsi) devices since hbtl is scsi addressing
and cciss is not a scsi device.
multipath actually "makes up" hbtl values for cciss devices
in its implementation, and gives the lun in the hbtl quartet
the default value '0'.

Change-Id: Ie94e5703b48ffc22fe8bda427d364faae4f7c256
Signed-off-by: Yeela Kaplan <ykaplan@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/12999
Reviewed-by: Ayal Baron <abaron@redhat.com>
Reviewed-by: Eduardo <ewarszaw@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>